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um: Remove locking in deactivate_all_fds()
Not only does the locking contradict the comment, and as the comment says is pointless and actually harmful (all the actual OS threads have exited already), but it also causes crashes when lockdep is enabled, because calling into the spinlock calls into lockdep, which then tries to determine the current task, which no longer exists. Remove the locking to let UML shut down cleanly in case lockdep is enabled. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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1 changed files with 0 additions and 3 deletions
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@ -384,10 +384,8 @@ EXPORT_SYMBOL(deactivate_fd);
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*/
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int deactivate_all_fds(void)
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{
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unsigned long flags;
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struct irq_entry *to_free;
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spin_lock_irqsave(&irq_lock, flags);
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/* Stop IO. The IRQ loop has no lock so this is our
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* only way of making sure we are safe to dispose
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* of all IRQ handlers
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@ -404,7 +402,6 @@ int deactivate_all_fds(void)
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to_free = to_free->next;
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}
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garbage_collect_irq_entries();
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spin_unlock_irqrestore(&irq_lock, flags);
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os_close_epoll_fd();
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return 0;
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}
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